November 2010
Intermediate to advanced
288 pages
8h 34m
English
book
Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation
by C. Britton Rorabaugh
Content preview from Notes on Digital Signal Processing: Practical Recipes for Design, Analysis and Implementation
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Note 65. Generating I and Q Channels Digitally: Rader’s Approach
This note presents an approach for generating inphase and and quadrature channels from a digitized, real-valued bandpass signal.
Radar and communications systems often involve quadrature receivers, which typically exhibit mismatch or imbalances between the amplitude and phase responses of their inphase and quadrature output channels. These imbalances introduce distortion into the signals of interest that are derived from the I and Q outputs of the receiver. Rader’s approach is one of several digital I/Q techniques that have been devised to form the I and Q signals directly from a single real bandpass signal and thereby avoid the I/Q matching limitations of analog quadrature receivers. ...
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